6.2. Inspection
6.2.1. Cylinder block
1) Clean the cylinder block thoroughly and check a visual inspection for cracks or damage.
2) Replace if cracked or severely damaged, and correct if slightly damaged.
3) Check the oil and water passing lines for restriction or corrosion.
4) Make a hydraulic test to check for any cracks or air leaks.
Hydraulic test : Stop up each outlet port of water and oil passages in the cylinder block,
apply air pressure of about 4 kg/cm
2
against the inlet ports, then immerse
the cylinder block in water for about 1 minute to check any leaks. (Water
temperature: 70°C)
6.2.2. Cylinder head
1) Inspection of cracks and damage
•
Carefully remove carbon from the lower face of the cylinder head using nonmetallic material
to prevent scratching of the valve seat faces.
•
Check the entire cylinder head for very fine cracks or damage invisible to ordinary sight
using a hydraulic tester or a magnetic flaw detector.
2) Distortion at the lower face
•
Measure the amount of distortion
using a straight edge and a feeler
gauge at six positions as shown in the
right figure.
•
If the measured value exceeds the
standard value, retrace the head with
grinding paper of fine grain size to
correct such defects.
•
If the measured value exceeds the
maximum allowable limit, replace the
cylinder head.
<Lower face warp and height>
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